So what's your take? Not worth the extra dollars or not a noticeable upgrade? Reducing the load on something so repetitive would have some kind of advantage, or a fiasco like Bosch plugs in the Northstar?

My reasoning is the original plugs are DENSO and these are DENSO too--not just a gimmick, same engineering.

Also, would there be a noticeable improvement in MPGs with new plugs?

Ranger

04-17-11, 06:54 PM

I seriously doubt you'd see any difference in mileage.

92Deville

04-18-11, 02:19 PM

Stick with the factory recomendations and put another 100K on it.

mtflight

04-18-11, 03:33 PM

Well they were only $12 more than the factory ones for the whole set. I'll report back if they fail to perform.

Yeah can't go wrong. That's what I was going to do, but since the AC Delcos are made by DENSO and according to them their Iridium is one up on their double platinums I took a chance for $1.50 more each than the AC Delcos. $3 more each than the DENSO label double platinums.

I got them from retailer in case they are a fiasco, I can get a refund/exchange for the ACDelcos/stock DENSOS.

I notice only the escalade is using Iridiums, all the Cadillacs still use the double platinums when I checked (I hope that's not a sign).

johnny kannapo

04-18-11, 04:21 PM

The Iridium plugs are a teeny bit less demanding on the coils and that is the advantage to them.

If a Denso Iridium plug fits the spec. coil life maybe extended by using them. You really can't go wrong using the OEM plug.